Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 197,969	$ 118,039
Short-term Investments	6,000	15,996
Accounts and unbilled receivables, net	33,258	33,285
Prepaid and other current assets	7,011	6,337
Total current assets	244,238	173,657
Property and equipment, net	14,614	15,238
Intangible Assets, Net (Excluding Goodwill)	11,844	12,650
Goodwill	20,908	20,096
Other long term assets, net	6,378	6,013
Total assets	297,982	227,654
Current liabilities:
Accounts payable	5,300	2,744
Accrued liabilities	10,420	7,279
Accrued payroll and other employee benefits	9,740	18,349
Deferred revenue	71,348	68,349
Total current liabilities	96,808	96,721
Long-term deferred revenue	13,514	11,389
Convertible Debt, Noncurrent	207,468	122,299
Other Liabilities, Noncurrent	655	639
Total liabilities	318,445	231,048
Commitments and contingencies (Note 6)
Stockholders' equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized; none issued	0	0
Common stock, $0.001 par value, 75,000,000 shares authorized; 36,123,975 and 35,001,236 shares issued, respectively; 31,706,390 and 30,583,651 shares outstanding, respectively	36	35
Additional paid-in capital	196,962	175,678
Treasury stock, 4,417,585 common shares, at cost	(13,938)	(13,938)
Retained earnings (Accumulated deficit)	(199,979)	(160,259)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3,544)	(4,910)
Total stockholders' equity	(20,463)	(3,394)
Total liabilities and stockholders' equity	$ 297,982	$ 227,654